There were strong relationships between exchangeable aluminium (Al) and
relative top yield, and between soil pH and relative top yield in the Garret
and Bisinella soils. Sweet potato plants produced maximum top yields at soil
exchangeable Al <3.0 cmol ((+)/kg, with a 10% yield
reduction coinciding with a value of approximately 5.0 cmol (+)/kg.
The value was lower for the Bisinella soil than the Garret soil. In the case
of pH, maximum yield in both soils was evident at a soil pH of 5.0 with
90% of maximum yield being achieved at about pH 4.7. These results
suggest that soil pH would be a good index for Al toxicity. The close
relationships between sweet potato growth and both exchangeable Al and soil pH
need to be explored further to determine whether it will hold across a wide
range of acid soil groups.
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